In the general inverter control system, there are many occasions to extend the three-phase four-wire leakage circuit breaker used before the installation of the general-purpose inverter. After the general-purpose inverter is put into operation, the frequency converter frequently trips during normal use. . The reason is that the output voltage of the general-purpose inverter contains harmonic components, so that parasitic capacitance is generated between the motor winding and the casing, and between the conductor and the ground. These parasitic capacitances form a leakage current through the conductor and the ground, the casing and the ground. The path, when the leakage current is greater than the setting current value of the leakage circuit breaker, the earth leakage circuit breaker will act to trip. Therefore, in the control system using the general-purpose inverter, if the above situation occurs, the original leakage circuit breaker needs to be replaced, or the carrier frequency of the inverter can be reduced to reduce the influence of the parasitic capacitance on the ground leakage current. Otherwise, The leakage current can only be isolated by installing an isolation transformer on the input side of the general-purpose inverter.
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